c# - DataGridView retaining old columns -

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i can't quite seem figure 1 out. i'm using datagridview in vs2013. i've got simple script pull tables , update grid view. seems work fine except datagridview seems appending columns instead of replacing them new ones.

i've looked around hours , have tried many remedies. perhaps can help?

here's code use far:

public centralstation(mysqlconnection _myconnection) {     initializecomponent();     myconnection = _myconnection;     myadapter = new mysqldataadapter();     mycommand = new mysqlcommand(" ", myconnection);     mydatatable = new datatable();     mybinder = new bindingsource();      populatetableselection(); }  private void button1_click(object sender, eventargs e) {     try     {         mycommand.commandtext = "select * tcpro." + this.tablemenulist.text + ";";         myadapter.selectcommand = mycommand;         mydatatable.clear();         myadapter.fill(mydatatable);         mybinder.datasource = null;         mybinder.datasource = mydatatable;         datagridview1.datasource = mybinder;         myadapter.update(mydatatable);     }     catch (exception ex)     {         messagebox.show(ex.message);     } } 

mycommand.commandtext = "select * tcpro." + this.tablemenulist.text + ";";

mycommand selects data different db tables, right? tables have different columns

myadapter fills same table

myadapter.fill(mydatatable);

data adapter doesn't clear rows , need mydatatable.clear(); that

so data adapter doesn't clear columns , need clear them too:

mydatatable.clear(); mydatatable.columns.clear();

it not datagridview fault


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